This shows grade level based on the word's complexity.
adjective
occurring every four years: a quadrennial festival.
of or lasting for four years: a quadrennial period.
noun
an event occurring every four years, as an anniversary or its celebration.
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In 2014, the quadrennial review by the Department of the Interior and the Forest Service laid out four scenarios for how the fire landscape might look in a decade or so.
California’s Forever Fire|by Elizabeth Weil, ProPublica, photography by Meridith Kohut for The New York Times Magazine|January 3, 2022|ProPublica
For many aspiring Olympians, the quadrennial event is the culmination of a lifetime of sacrifices to compete against the best athletes in the world while representing their country on an international stage.
The Olympic Games are a quadrennial opportunity for thousands of elite athletes to come together not just in pursuit of sporting greatness, but in the name of humanity.
On Monday morning, Bowser said at a news conference that she urged all Americans to stay home rather than travel to Washington, a city that normally welcomes the quadrennial flood of inauguration tourists with open arms.